Performance of Dispersion-Reduced Wavelength Assignment in Wavelength-Routed Optical Networks

This paper analyses the performance of the dispersion-reduced wavelength assignment (DRWA) scheme in wavelength-routed optical networks. The signal quality degradation due to the dispersion effect in longer lightpaths is higher than that of shorter lightpaths in a dispersion uncompensated network. DRWA assigns the longer distance lightpath requests to the wavelengths having a lower dispersion effect, and the wavelengths having a higher dispersion effect are allocated to the shorter distance lightpath requests. Thus, the signal quality of longer lightpaths is maintained. As a result, blocking of longer lightpath requests due to the dissatisfaction of signal quality is reduced. Simulation results show that the DRWA scheme suppresses the blocking probability and improves the traffic admissibility compared to the conventional schemes.